C++ - Forward List clear() Function
The C++ forward_list::clear function is used to clear all elements of the forward_list. This function makes the forward_list empty and contains no elements.
Syntax
void clear() noexcept;
Parameters
No parameter is required.
Return Value
None.
Time Complexity
Linear i.e, Θ(n).
Example:
In the below example, the forward_list::clear function is used to clear all elements of the forward_list called f_list.
#include <iostream> #include <forward_list> using namespace std; int main (){ forward_list<int> f_list{10, 20, 30, 40, 50}; forward_list<int>::iterator it; cout<<"Before clear() function: \nf_list contains:"; for(it = f_list.begin(); it != f_list.end(); ++it) cout<<" "<<*it; f_list.clear(); cout<<"\n\nAfter clear() function: \nf_list contains:"; for(it = f_list.begin(); it != f_list.end(); ++it) cout<<" "<<*it; return 0; }
The output of the above code will be:
Before clear() function: f_list contains: 10 20 30 40 50 After clear() function: f_list contains:
❮ C++ - Forward List